Which two disorders were more characterized as degenerative disorders in the DSM-IV rather than as autism disorders?

• A. Asperger syndrome and Pervasive Developmental Disorder
• B. Rett syndrome and childhood disintegrative disorder
• C. Social Pragmatic Communication Disorder and Nonverbal Learning Disorder
• D. Fragile X syndrome and Landau-Kleffner syndrome

Answer: (B)

Rett syndrome and childhood disintegrative disorder were indeed characterized as degenerative disorders in the DSM-IV, setting them apart from the other conditions classified under the autism spectrum. Rett syndrome is particularly noted for its progressive impact on development, typically seen in girls, where there’s a regression in motor and social skills following a period of normal development. Childhood disintegrative disorder also involves a significant loss of previously acquired skills, which can appear after two years of normal development, leading to substantial developmental regression.

Both these disorders emphasize degeneration in abilities, contrasting with other autism spectrum disorders which, while they may present a wide variety of challenges and developmental differences, do not have the same pattern of regression and degeneration. This delineation made by the DSM-IV was crucial for diagnosis and treatment approaches within the broader spectrum of autistic disorders.